Dampen old generation allocation limit after scavenge if allocation rate is low.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 270feda587be961ae9fde87ac3f50a7d784d7142..5a1a2b8a02c0cc1b4d2de2e30ef28e7186fea717 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1176,6 +1176,10 @@ class Heap {
   // Sets the allocation limit to trigger the next full garbage collection.
   void SetOldGenerationAllocationLimit(intptr_t old_gen_size, double gc_speed,
                                        double mutator_speed);
+  // Decreases the allocation limit if the the allocation rate is low.

[Hannes Payer (out of office), 2015/06/16 22:29:22]

This function does not depend on low allocation rate, we check that outside.
Just say here that this function may decrease the allocation limit if the new
limit based on the given parameters is lower than the current limit.

[ulan, 2015/06/17 08:47:45]

Done.

+  void DampenOldGenerationAllocationLimit(intptr_t old_gen_size,
+                                          double gc_speed,
+                                          double mutator_speed);
 
   // Indicates whether inline bump-pointer allocation has been disabled.
   bool inline_allocation_disabled() { return inline_allocation_disabled_; }